The Type Histogram, located in the upper right of the heap analyzer
  screen, allows you to see statistical summaries on segments of the same
  segment type.

  Use the Type Histogram to:

   -  Check the percentage of total segments represented by a segment
      type.  The left histogram shows this percentage graphically.  Click
      on an individual segment type to see a numerical percentage.

   -  Check the percentage of the total bytes allocated to a segment
      type.  The right histogram shows this percentage graphically.
      Click on an individual segment type to see a numerical percentage.

  The total number of segments and the total number of bytes (recognized
  by the heap analyzer) appear at the top of the histogram window.

  For information on Type Histogram context-sensitive pop-up menus, see
  the additional topics below.

  For information on other heap analyzer screen locations and pop-up
  menus, click the 'On Context' menu item in the heap analyzer Help menu,
  then click the location of interest.

  For information on using the heap analyzer, see the 'On Window' menu
  item in the heap analyzer Help menu.